import java.util.Scanner;

public class ThreadDemo4 {

    volatile public static  int flag=0;
    public static void main(String[] args) {
        Thread t1=new Thread(() -> {

            while(flag==0)
            {
                //循环为空

            }
            System.out.println("循环结束,t1结束");
        });
        Thread t2=new Thread(() -> {

            Scanner sc=new Scanner(System.in);
            System.out.println("输入一个整数");
            flag=sc.nextInt();
        });

        t1.start();
        t2.start();
    }
}
